Drawing-board.



PATENTED NOV. 27, 1906.

H. L. BURBANK & J. W. MANSON.

DRAWING BOARD.

APPLICATION FILED MAY16, 1906.

2 SHEBTSSHEET 1.

WITNESSES: INVENTORJY No. 836,919. PATENTED NOV. 27, 1906.

H. L. BURBANK & J. W. MANSON.

V DRAWING BOARD. APPLICATION FILED MAY 16, 1906.

2 SHEETSSHEET 2.

ll/ AVA IN VEN T ORX WITNESSES.-

UNITED STATES PATENT OFFICE.

HENRY L. BURBANK AND JAMES W. MANSON. OF AKRON, 01110.

DRAWING-BOARD.

Specification of Letterslatent. v

' Patented Nov. 27, 1906.

Application filed May 16, 1906. Serial No. 317,200.

- To all whom it may concern:

Be it known that we, HENRY L. BURBANK I and JAMES W. MANSON, citizens of the United Drawing-Boards, of which the following deof the rotary t scription, in connection with the accompanying drawings, is a specification, like figures on the drawings representing like parts.

Our invention relates to improvements in drawing-boards, especially to drawing-boards e; and the objects of theinvention are, st, to provide such a drawing-board with improved and novel devices as can be manipulated by the draftsman with efficiency, celerity, and accuracy in making any class of drawings, and which drawingboard consists, essentially, of a rotary board, an independently-movable member, and pivotal bearing members, which essential elements are so arranged as to provide a mechanism for rotating the board and stopping the rotation quickly and accurately at any desired point, as well as a means for holding the board firmly at any oint of stop ing; second, to provide a straig t-edge or ru e e culiarly controlled by means of an adjusta le cable and so arranged as to be movable at will in'such a manner that the successive positions of the ruling ed e are parallel to each other across the rotary card and either with or without relation to a 1pficuliarly-adapted gradatory device, and, t d, to provide a drawin -board with im roved and novel devices Wfiich enable the raftsman to dispense with the use of the T-square, triangle, and protractor as independent instruments and to procure by means of the movable straightedge, together with our rotatory and gaging devices, the same results as are obtained by use of the aforesaid instruments.

- Further objects and advantages of the in-, vention are in reference to the details of. structure and use and are hereinafter more particularly described and claimed,

In the drawings forming part of this s ecification, Fi' e 1 is a lan view, seen om above, of t e drawingoard with parts assembled in preferable arrangement showing novel features and principles of t c invention.' Fig. 2 is a vertical cross-section of Fig. 1 on the lme a; :0. Fig. 3 is a plan view, seen from above, of the lower pivotal member of the Jtatory mechanism. Fi 4 is a vertical cross-section of Fig. 3 on the inc 8 s. Fig. 5

is a plan view, seen from above, of the top pivotal bearing member ofv the rotatory mechanism, together with the spring-actuated locking device. .Fi 6 is a vertical cross-section of Fig. 5 on t e line 10 p. Fig. 7 is a plan view, seen from above, of the indeendent member with indicator and fastenlng device. Fig. 8 is a vertical cross-section of Fig. 7 on the line 1' r: Fig. 9 is a plan view, seen from above, of a graduated arc to be permanently attached to some portion of the framework and to be used in connection with the indicator on the arm of the movablemember. Fig. 10 is a side elevation of a gradatory device which may be used in connection with the movable straight-edge.

Referring now more in detail to the drawings Fig. 1 shows the preferable working mechanism of our invention.

1 and 2 in Fig. 1 are stationary approximately parallel side pieces Whose top surfaces are approximately in the same plane as the up er surface of the rotary board 10, Fig. 1, an may be attached to any suitable base or frame and may be at any desired distance apart.

3 and 3, Fig. 1, are diagonal beams forming part of the framework or base for the rotary mechanism hereinafter described.

4, Fig. 1, is a beam also forming a part of the framework or base aforesaid. This said framework provides a base suitable for placing the novel devices for rotation and stopping and affords suitable stations for the location of the sheaves 8, Fi 1.

5, Fig. 1, is a slotted racket resting upon the beam 19 and afiording a means for allowing a movement forward and backward of the a ustable sheave 9 and for fastening this movable sheave at any desired oint by means of a set-screw or other suitab e device, by which movement the tension of the cable is regulated.

6 and 7, '1, are cross-beams further formin part 0 the aforesaid framework. 6 also a ords a suitable support or fastening-base for the slotted bracket 5 and the beam'19.

8, Fig. 1, represents four guide-sheaves stationed, preferably, at the ends of the side pieces 1 and 2 for the urpose of directing the movement of the ca 1e 20. The sheaves 8 are part of the cable device for producing movement of the straight-edge 14 in such a manner that the successive positions of the ruling edge are parallel to each other ICC 9 is the movably-adjustable sheave by which tension of the cable 20 is regulated by sliding the sheave and the slotted bracket 5 backward or forward as above set forth.

10 is a board or table of any material, size, or shape consistent with the size and construction of the base or the framework above desc ibed.

11, Fig. 2, is a flanged thimble forming the base member of the rotatory device and which is suitably attached to the base or framework heretofore described.

12, Fi 2, is the flanged portion of an independent y-'movable member used in connection with the base and top members of the rotatory mechanism.

13, Fig. 2, is a flanged bearing member, preferably of some suitable casting metal, attached in some suitable manner to the under side of the board 10. This flanged bearing member 13 forms the top member of the novel rotatory mechanism and is disposed rotatably within the circular opening of the flanged thiinble 11 in Fig. 2.

14, Fig. 1, is a movable straight-edge suitably attached to an endless cord or cable 20, so as to move at will in such a manner that the successive positions of the ruling edge are parallel to each other along the side pieces 1 and 2 and across the upper surface of the board 10.

15, Fig. 1 and Fig. 9, is an are made, preferably, of some metal and with a graduated scale upon its upper face attached to the framework, as shown in Fig. 1, by any suitable means and located at any convenient station.

16, Fig. 1 and Fig. 7, is an indicator made a part of or attached to the arm of the independently-movable member and made 'of suitable size and ada tability to move easily along the inner pcrip ery of the are 15.

17, Fi 5, is a spring-actuated catch or dog, pre erably pivoted at some suitable point in the top bearing member 13 by means of a pin 18, Fig. 6.

18, Fig. 5 and Fig. 6, is a pin affording a siuitable fulcrum or hinge for the catch or og 17.

19, Fig. 1, is a short cross bar or beam between 1 and 6, affording a support for the slotted bracket 5.

20 is a flexible endless cable arran edto move about the sheaves 8 and 9 and ing attached to the straight-edge 14 affords a means for moving the straight-edge in such a manner that the successive ositions of the ruling edge are parallel to eac other.

21, Fig. 7, is an arm or lever attached to the flanged portion 12 of the movable memberextendim beyond the board 10 and attachable to the are 15.

22, Fig. 1 and Fig. 7, is a set-screw or clamping device for fastening the movable arm 21 to the are 15.

- member, a mova 23, Fig. 10, is a serrated bar attached to the side piece 1 by means of set-screws.

24, Fig. 10, represents diagonal downwardslanting slots in the serrated bar 23. 1

25, Fig. 10, represents staggered teeth projecting downward from the straight-edge 14.

26, Fig. 10, is one of the set-screws for fastening the serrated bar to the side piece 1.

Heretofore in the making of rotary drawing-boards means have been provided for r0- tating the board and stopping its rotation at certain well-known and frequently-used degrees of rotation, such as thirty, forty-five, sixty, and ninety degrees.

The movable straight-edge so arranged as to move by means of a cable device in such-a manner that the successive positions of the ruling edge are parallel to each other at will across the top of the rotary board has been used heretofore in connection with various styles of drawing-boards. Certain devices for securing the means whereby a series of parallel lines at the interval of equal distances may be made have likewise been in use. The object of our invention is to provide simplified and improved devices for producing these above-mentioned results and in addition thereto to provide means for measuring the degree of iotation of the rotating board and forstopping the rotation of the board at any desired point and for holding the board at such point of stoppage, and, furthermore, in our invention we rovide a simple and eflective device for regu ating the tension of the cable used in connection with the movable straight-edge.

()ur novel rotatory, gaging, and stoppage device in its preferable construction consists of a top bearin member, a base bearin %le member with a notche flanged portion and an arm or lever, a catch or dog fastened to the top-bearing member, a graduated are, an indicator, and a set-screw or clampin device.

The top earin member 13 is fastened to the under side of t e rotary board, and thereby furnishes a pivotal center 11 on which the board may rotate. Further, t e top bearing member aflords'a base or seat of attachment for the spring-actuated dog or catch 18. This dog or catch is of suitable size and construction to fit snugly into the notches or indentations in the flanged portion 12 of the movable member and is wedge-shaped in design, so as to correspond with the notches with which it interchangeably engages.

The dogor catch is actuated by a spring of sufficient strength as to hold the board firmly at rest when the catch and notch are engaged and yet not so strong as to prevent rotation of the rotary board under stress of suitable force. I

The wedge-shaped design of both notch and catch permit of rotation in either direction and to any desired degree of angularity;

but the stoppage device so'fa-r' described is only efiective at the points determined by the location of. the notches in the flanged portion of the movable member. Nowas the number of notches in the flanged portion 12 of the movable member must of necessity for convenience. and accuracy be limited in number and .as it becomes necessary to rotate the board to some other degree of angularity in relation to the straight-edge or to some base line, we have provided a means whereby this may be accomplished easily, quickly, and accurately. i

- Our novel devices for this purpose operate in the following tated to approximately the position required and there brought to a state of rest by means tion our ca of the rotatory and stoppage device heretofore particularly explained. Then by means of the arm or lever 21 of the movable member any slight degree of angularity may be either added to. that already acquired or .be deducted from it by a movement forward or backward of this said arm or lever. The degree of movement of the arm or lever and accordingly the degree of the rotation of the rotary board is measured accurately by means of the graduated arc 15, together with the indicator 16, carried on the arm near to its extremity and moving along the inner periphery of the said are 15. The base memer 11 of this rotatory mechanism is attached to the base or framework before described in some suitable manner, and when so attached it forms a bearin or socket within which the top bearing mem er 13 is rotatably disposed. The shank of the base bearing member 11 forms a spindle around which the movable member rotates concentrically when moved by the movement of the lever 21 in securing the precise degree of rotation desired in the manner above set forth. The extremity of the arm or lever 21 is fastened by means of a clamping device, so as to hold it firmly in a state of rest, except when it is necessary to move it in aging t e exact degree of rotation desired. s to the matter of the movable straight-ed e in connection with our invenile device is of simple construction and has a novel device afforded by the movable sheave, whereby the tension of the cable is readily re ulated. The cable is so threaded around the five sheaves or pulleys that its movement at the two ends of the attached straight-edge is equal and in the same direction. As it frequently becomes desir: able for the draftsman in his work to produce a series of equidistant parallel lines, we have in our invention provided a device whereby this may be accomplished without the necessity of previously marking and measuring distances and without necessitating the use of independent scales .or special section-lining instruments. Our device for this purpose. is constructed upon the following plan: Upon manner: The board is 'rodesired to secure or to dispense with its use, 'respectively, as the draftsman may desire.

; two teeth or projections extending 5 ward from the under surface of the movable l straight-edge. to the side piece 1 by means of set-screws or other convenient devices in such a manner as to permit .of its being raised or lowered in l suitably-provided diagonal slots, =thus en- 'gaging or disen aging it with the teeth or the outer side of the side iece'l is attached,

' a size to be compatible with a function, herein presently described, in connection with down- Said serrated bar is attached projections of t e straight-edge when it is to the serrated bar and are of suitable size edge when assisted and influenced by the straight-edge is permitted by the sa 'the adjustable endless flexible ca relatively to the indentations and teeth of the serrated bar as to permit of advancement or retreat in the movement of the straightslight side movement back and forth of the straight-edge, which side movement of the ing of le 20. This slight movement'back and forth of the straight-edge combined with such degree of forward or rearward movement as is permitted by the staggered arrangement of the teeth and their relative size in comparison with the indentations and teeth of the serrated bar produce the results which we claim for our novel device as a means for affordin the facilities for drawing equidistant par- .al el lines.

In case it be desired to have the lines at a greater distance apart than the space of the movement afforded by a single combination of the aforesaid movements it is possible to secure such results by combining a series of these joint movements, and thereby obtaining a series of equal distances which are multiples of the space made available by a sin le combination of movements.

We do not limit ourselves to the preferable construction and arrangement of parts herein described, as the same may be modified in various ways without departing from the spirit of our invention or without sacrihcmg any of its advantages.

is evident that the location of the notches on the independently-mowable member, as herein set forth, might be on the top pivotal bearing member and the catch or dog might be located on the independentlymovable member. Also it is evident that there may be many forms of construction and arrangement of these anembers which might be employed to ohtain'the same results as claimed for our invention. It is further evident that the combination of the top bearing member, the base bearing member,

the movable member might be held in position by suitable guides.

Having described our invention, What We claim as new, and desire to secure by Letters Patent, is p 1. In a rotary drawing-board, anindependently-mo-vable member having a flange, an arm projecting from the said flange, and: notches at'the periphery of the said flange, in combination with the rotating board and: supporting-frame of'the said rotary-drawing boai d, a graduated are mounted on the said supporting-frame beyond the outer edge oii the said rotating board, the said; graduated arc being a support to which the said PIX)? jecting arm is attachable at any dBSlIYBCl point within the limits of. thesaid arc, and-a spring actuated dog, mounted on the underside of the said rotating board and-engaging interchangeably with the said notches, substantially as set forth and described 2. In a rotary drawing-board, an'ad-jusa. able sheave 9 situated equidistant from the upper and the lower two lefit-hand sheaves oi the four sheaves 8 and attachable to. and; movable upon the supporting-frame oi the said rotary drawing bo'ard, in combination with a supporting-frame, a sheave 8 at each of the four corners of the said supporting,- frame, an endless flexible cable supported by and running over the said tour sheaves 8 and:

the said sheaves 9, said cable crossing at the. I

' said-sheave 9. feradjnstment of, tension, and 'a straight-edge attached atits ends to the said; cable and movable upon: the. upper face oftherotating. board of theisaid: rotary drawing-board, substantially as set forth and de scribed.

3. In: a rotary drawing-board, the combanation. of a supportingeframe, a rotating board rotatably mounted thereon, a straightflexible cable attached to said straight-edge, sheaves stationed respectively at the four corners of the said supporting-frame and supporting" the said flexible cable, a movablyadj usta'blesheave attachable to and: mounted on the said supportingrfirame, said flexible cable crossingiat theisaid movably-adjustable. sheave, a graduated arc attachedmo the-saidsu portingrfra'me, an independently-mom. abl e. member having a flange and rotatably disposed aroundz-thecen-ter of'rotation: ot the said rotating-board, an army projecting-from ithe said flange to the said graduated: are, matches at theperiphery of the Sfiifll flange, and. a springeactuated dog-rotating with the said rotating board; and? engaging. inter.- changeably with the. said notches, all as sembled and; o eratingsubstantially asv set forthand'd'escr ed;

testimony whereof we have signed our names to this specificationin the presence of two-subscribing witnesses.

L BURBANK. JAMES W. MANSON.

Witnesses:

M. Z. L. FULLER, J. Ross HUFFMAN;

edge movable upon thesaid-rotating board, a 

